Improvement in nut-locks



UNITED STATES ADDISON O. FLETCHER, OF NEW YORK, N. Y.V

IMPROVEMENT IN NUT-LOCKS.

Specification forming part of Letters Patent No. 152,737, dated July 7,1874; application filed December 22, 1873.

To all whom it may concern:

Beit known that I, ADDISON C. FLETCHER, of the city, county, and Stateof New York, have invented an Improved J am or Lock Nut, of which thefollowing is a specification:

This invention is designed to furnish a simple and cheap means ofsecuring nuts in place an article much needed on railways and on variousmachines in which the least jar is ex# perienced.

This invention is illustrated by a drawing, in which Figure l representsa top View of my jam or lock nut; Fig. 2, a view of the under side ofthe same. Fig. 3 is a central trailsverse section thereof taken on theline :t w on Fig. l or 2. Fig. 4 shows the same, in section, as about tobe applied to a bolt. Fig. 5 is the saine after having been struck up toits bearing. Fig. 6 shows a jam-nut of cast metal applied in likemanner. Fig. 7 is a longitudinal section of a tool adapted to strike upsuch jam-'nuts in their application 5 and Fig. S is a face-end view ofthe same. Y

The same letters occurring on the several iigures indicate like parts.

This jam or lock nut is intended to be made of sheet-lead or other softmetal or compressible material, cut and formed by suitable dies, or itmay be cast in molds.

The main portion A, when formed of sheet metal, being circular, and itscentral portion B cupped up to about a hemispherical contour, and at thesame time that the portion B is thus cupped up, the under side of theange or main portion A is indented with a series of radial cavities, a,to the depth of about onehalf of the thickness of the metal, a portionof said flange being entirely cut away,A as shown at b.

l/Vhen cast in molds, I make it of a form somewhat resembling a thimble,with a slit, c, in one side of sufficient width to allow the body to becompressed into the threads of the bolt before said slit is entirelyclosed.

In the application of this jam-nut to a bolt, it is to be placed on theend or,l nose of the latter, as represented in Fig. 4, and a die,similar to that represented in Figs. 7 and S, is used to dei-lect theilange portion,-and to coinpress it on, in, and around the threads ofthe bolt, and against the nut d thereon, whereby it is so closelycompacted around the bolt and between its threads as to prevent -anyprobability or possibility ot' the nut d being loosened by ordinary jaror like causes.

That I claim, and desire to secure by Letters Patent, is

l. A jam-nut constructed of soft metal, susceptible of compression intoand around the threads of a bolt, in the manner substantially as shownand described.

2. A disk of soft metal formed with radial depressions a, or corrugatedradially, substantially as and for the purpose specitied.

3. rlhe method of securing a nut upon a4 bolt, by the compression of asott-metal cap around the protruding portion ofthe bolt and against thenut, substantially as set forth.

ADDISON C. FLETCHER.

Witnesses:

W. MORRIS SMITH, LW. HAMILTON J oHNsoN.

